The amount of money required to start a business and eventually generate $100,000 per year in revenue can vary greatly depending on the industry, business model, location, and individual circumstances. However, I can provide a general overview of the different stages and costs involved in starting a business.

1. Idea and Research Stage: This is the initial phase where entrepreneurs come up with a business idea and conduct market research to validate its feasibility. Costs during this stage can include market research reports, industry analysis, and possibly hiring consultants. These costs can range from a few hundred to several thousand dollars.

2. Business Plan Development: Creating a comprehensive business plan is crucial for attracting investors or securing loans. Costs associated with this stage may include market research, professional writing services, and software tools. Depending on the complexity of the business plan and the assistance required, costs can range from a few hundred to a few thousand dollars.

3. Legal and Regulatory Requirements: Registering the business entity, obtaining licenses and permits, and complying with local regulations are essential steps. Costs can include legal fees, registration fees, and other administrative expenses. These costs can vary significantly depending on the business structure and location, ranging from a few hundred to several thousand dollars.

4. Infrastructure and Equipment: Depending on the nature of the business, costs can arise from leasing or purchasing office or retail space, renovating the premises, and acquiring necessary equipment or machinery. Costs can vary widely based on location, industry, and business size. For example, a small home-based service business may require minimal investment, while a manufacturing company may require significant capital for equipment and facilities.

5. Marketing and Advertising: To generate revenue, businesses need to invest in marketing and advertising efforts to attract customers. Costs can include website development, online advertising, print materials, social media campaigns, and more. The amount spent on marketing can vary greatly depending on the industry, target market, and desired reach.

6. Operational Expenses: Once the business is up and running, there will be ongoing operational costs such as rent, utilities, insurance, salaries, inventory, and raw materials. These costs will vary significantly depending on the industry and business model. It is important to consider these expenses while calculating the revenue required to reach the $100,000 mark.

It is crucial to note that the above breakdown provides a general overview, and the actual costs can vary greatly depending on the specific business. Additionally, it may take time for a business to reach the $100,000 revenue mark, and profitability may not be immediate. Therefore, careful financial planning and realistic projections are essential for long-term success.

References:
- U.S. Small Business Administration: www.sba.gov
- Entrepreneur: www.entrepreneur.com
- Investopedia: www.investopedia.com